taking immediate advantage, often unethically, of any circumstance of possible benefit
同义词：opportunistic, timeserving
opportunist例句
One who conforms to the prevailing ways and opinions of one's time or condition for personal advantage; an opportunist.
随波逐流的人为了个人好处而认同自己所处时期或状况中流行的方式或观念的人; 机会主义者
There were many opportunists and few men of principle.
机会主义者多，坚持原则的人绝无仅有。
opportunist详细解释
op.por.tun.ist n.（名词）One who takes advantage of any opportunity to achieve an end, often with no regard for principles or consequences.机会主义者：指常不顾原则和后果而抓住一切机会追求自己利益的人 【引伸】 op.portun.ism n.（名词）
